<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div>
  <h1>修改商品页面</h1>
  <input type="text" v-model="p.id">
  <input type="text" v-model="p.title">
  <input type="text" v-model="p.price">
  <input type="text" v-model="p.num">
  <input type="button" value="修改" @click="update()">
</div>
<!--引入axios和vue框架文件-->
<script src="https://cdn.bootcdn.net/ajax/libs/axios/0.21.1/axios.min.js"></script>
<script src="https://cdn.staticfile.org/vue/2.2.2/vue.min.js"></script>
<script>
    let v = new Vue({
        el:"body>div",
        data:{
          p:{id:"",title:"",price:"",num:""}
        },
        methods:{
          update(){
              //发出异步修改请求
              axios.post("/update",v.p).then(function (response) {
                  //显示到列表页面
                  location.href="/list.html";
              })
          }
        },
      created:function () {
        //发请求通过商品id查询商品信息   location.search = ?id=6
        axios.get("/selectById"+location.search).then(function (response) {
            //服务器端响应的是Java对象
            //客户端得到的是JS对象
          v.p = response.data;
        })
      }
    })
</script>
</body>
</html>